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Altera_Forum
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18 years ago

Asynchronous signal synchronization

I have seen two circuit for synchronizing Asynchronous signal as the following shows: http://blogimg.chinaunix.net/blog/upfile2/080115160658.jpg Any different between them?
Altera_Forum's avatar
Altera_Forum
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18 years ago

The top circuit is design to go into reset asynchronously but come out of reset synchronously. The bottom circuit goes into and out of reset synchronously. The top circuit is important to use in cases were a reset stops the clock.